Note: Descriptions are shown in the official language in which they were submitted.
i.267~4;~
This invention relates to a permutation lock
and, more particularly, to an adjustable time delay device
for preventing unlocking of the lock after a predetermined
time from inserting the code in the permutation lock.
Pushbutton mechanical loeks are available in the
market today. These locks, however, have a drawback in
that there is no automatic relocking feature with time
delay. Por example, an authorized person wishing to open
the door enters the eorreet code. For some reason or
other, if he has to leave without opening the door, or
someone else opens the door for him on the inside of the
building, the eode remains in the lock. There is no
automatie feature available meehanieally to decode or relock
the lock. In such eases, any unauthorized person ean open the
door not knowing the secret code, by simply actuating the
knob or handle.
The invention detailed below allows the opening
of the loek for a seleeted period of time when the door
knob is turned and the correet eode is inserted. If the lock
is not opened within the duration of the selected time,
the lock automatically disables the opening mechanism
of the lock, eliminating the possibility of unauthorized
entry.
U. S. Patent No. 3,747,377 to Van Deudekom, shows
a permutation loek with a pushbutton eontrol for the loek
ehamber and doorknobs on the inside and on the outside of
the door to operate the lateh. A linkage eonneets the loek
ehamber with a elutch of the doorknob to control the operation
of the loek. This patent shows a eonventional loek in
whieh there is no means for automatieally eaneelling the
eode in the loek eham~er if the door were opened from the
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i2675~3
inside of the building when the code was inserted.
Accordingly, the applicant has provided for an adjustable
time delay which will automatically disable operation of the
lock if the door is not opened from the ou-tside within a
predetermined time.
It is an object of this invention to provide a
time-delay device on a permutation lock for disabling operation
of the lock a predetermined time after entry of the code
in the lock chamber, and if the lock has not been operated.
It is another object of this invention to provide
a time-delay device on a permutation lock disabling operation
of the lock a predetermined time after entry of the code if
the lock has not been operated.
It is a further object of this invention to provide
a time-delay device on a permuation lock operating a micro-
switch monitoring the operation or attempted operation of
the lock and providing a signal at some remote location of the
attempted opening of the lock.
The objects of this invention are accomplished by
a permutation combination lock with pushbutton chamber control
for entering of the code. The latch operator is provided
for selectively unlatching the latch when the code is entered
in the lock chamber. A time delay device on the permutation
lock operates in conjunction with the latch operator to
disable operation of the lock after a predetermined time
has lapsed subsequent to the entry of the code in the
lock chamber. This prevents unauthorized entry by a person
even though the code is entered in the lock chamber. In
order to place the time delay device in an opening mode,
which is done by rotating the latch, a linkage scrambles
or cancels any code on the permutation lock chamber and
thereby requires reentry of the code before opening of the
lock.
~X675'~3
Referring to -the drawings;
FIG. 1 illustrates a front elevation view of the
permutation lock and lock chamber;
FIG. 2 is a cross section view showing the
permutation lock cham~er, latch operating means and a clutch
with a linkage connected between a control shaft on the
lock chamber;
FIG. 3 is a cross section view taken on line 3-3
of FIG. 2, showing the linkage connected between the control
shaft on the permutation lock chamber in the neutral position,
and the clutch for unlatching the latch element;
FIG. 4 is a cross section view similar to FIG. 3,
showing the position for the linkage for scrambling the code
in the lock chamber and resetting the time-delay device in
the opening mode;
FIG. 5 is a similar view to that of FIG. 3, showing
a linkage between the control shaft of the permutation
lock chamber and the clutch, for driving the unlatching
mechanism to the unlatching position;
FIG. 6 is a cross section view taken on the plane
on the lines 6-6 in FIG. 3, showing the cam surfaces on the
linkage;
FIG. 7 is a three-dimensional view of the control
shaft arm on the lock chamber, showing the cam surfaces
for operating the time-delay device;
FIG. 8 is a cross section view showing the linkage
and clutch in the operating pos~tion, as shown in FIG. 4,
for the scrambling of the code in the lock chamber and
resetting of the time delay device;
FIG. 9 is a cross section v~ew with the linkage in
a position similar to that as shown in FIG. 3; and
FIG. 10 is an exploded view of the clutch, showing
the components in the clutch.
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1~6~5~
Referring to the drawings~ ~IG. 1 illustrates
the permutation lock 1 on a door 2~ an outside door knob
4 and the inside doorknob 18. The latch element 44 is in
the extended position for engaging a stop in the plate 22.
The pushbuttons 5 are provided for inserting the code in
the lock chamber which is immediately behind the panel 6.
FIG. 2 illustrates a cross section view of the
device shown in FIG. 1, with the lock chamber 7 immediately
behind the pushbuttons 5 and panel 6. Rotation of the
control shaft 8 is controlled by the lock chamber mechanism.
A time-delay device 9 is positioned in a cavity 10 in the
door 2. The time-delay device 9 includes a plunger 11 which
extends forwardly into the compartment 12 and interferes
with the operation of the linkage 13. The plunger 11 is
retracted by the cams 28 and 29 when the linkage is operated
and progresses forwardly to an interfering position during
a predetermined time interval. The microswitch 16 provides
terminals for that connection to a signalling device which
will indicate if there is tampering or opening of the lock.
The indicator can be positioned at a remote location to
provide the owner a means of determining when there is
someone attempting to operate the lock. An adjustable
knob 17 controls the time interval for operation of the
time delay deviee 9. For the purpose of illustration,
the device may be an air control device with a diaphragm and
an adjustable orifice controlled by an adjustable knob 17 to
control the duration of time for the plunger to move forward
to an extended interfering position.
The inner knob 18 on the inside of the door will
operate the latch element 44 without use of the permutation lock
1.
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~ 267543
The outer knob 4 operates through a drive shaft
19 extending intc the clutch 20. A shaft 21 extends into
the latch operating mechanism behind the plate 22.
FIG. 3 illustrates the position of the linkage
and the control shaft when the latch is in the extended position
and the door is latched. The housing 23 encloses the lock
chamber 7 and the control shaft 8 is rotated to neutral
position, as shown. The control shaft arm 24 extends to the
link 25. The control shaft arm 24 also has two cam arms 26
and 27. The cam 28 on cam arm 27 resets the time-delay
mechanism when the linkage is operated to scramble the
code in the lock chamber 7. The plunger 11 is shown in
section and extended to an interfering position with the
linkage. The cam 29 operates to reset the time delay
mechanism if the linkage has been rotated to its position
shown in FIG. S and retained in th~s position long enough
for the time dela~ mechanism to cycle to its extended
position.
FIG. 6 illustrates a section view of the cams and
the plunger 11;
FIG. 4 illustrates the scrambling or "cancelling"
position, and also the reset position for -the time delay
mechanism. The control shaft arm 24 has been rotated in
a clockwise direction, as viewed in FIG. 4 relative to the
view in FIG. 3. The reset disc 30 has been rotated in a
counterclock~ise direction and the linkage has changed position,
as indicated. This operation scrambles the code in the
lock chamber 7;
FIG. 5 illustrates the l~nkage moved to a position
for retracting a latch. The linkage has shifted to the position
where the clutch actuator disc arm 31 is rotated in a counter-
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~-
iX67S~3
clockwise direction. Thi~ carries the lin~s 32 and 33 to the
position shown. The reset disc arm 3~ remains in the
fixed position;
To rotate the linkage ta this position, normally the
cam 29 would interfere with the plunger 11 unless the linkage
is rotated in a clockwise direction first allowing the cam
28 to reset the plunger 11 and move it out of the way of the
linkage. If the latch mechanism were held in this position
for any length of time for the duration of the return cycle
of the time delay mechanism, the cam 29 would reset the time
delay mechanism when it is rotated in a clockwise direction
to the normal latch extended position;
FIG. 8 illustrates the position for resetting or
scrambling the code in the lock chamber, while FIG. 9 shows
the clutch in the unlatching position;
FIG. 10 illustrates the components of the clutch
for transmitting the unlatching force from the outer knob
4 to unlatch the latch 44;
FIG. 10 shows the reset disc 35 integral with a
reset disc arm 30 connected through the pin 36 to the link 32.
The reset disc 35 is provided with the tabs 38 which drive
through the slots 39 in the cammed clutch disc 40. The reset
disc 35 is also provided with the tabs 41 which extend
forwardly into the openings 42 on the plate 43 of the housing.
The housing also includes the housing member 14 which has an end
wall 45 and the cylindrical portion 46.
The cammed clutch disc 40 is formed with protrusions
47 and 48 each having cammed surfaces 49 and 50. These
cammed surfaces engage mating cam surfaces 51 and 52 on the
protrusions 53 in the c].utch actuator disc 54. Nor~ally the
spring 55 biases the cammed disc 40 in engagement with the
clutch actuator disc 54 and the cammed surfaces provide a
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~26754;~
drive between the t~o disc~. ~he spring 55 provides a
force to overcome the spring 56 and provide the drive.
Spring 55 also biases the clutch actuator disc 54 forwardly,
causing the surface 57 on the forward ends of the
cylindrical portion of the disc to engage the reset disc
35 and bias the reset disc 35 so that the tabs 41 enter the
openings 42 and lock the reset disc to the housing plate 43.
The cammed disc 40 is formed with a hub 58 which
extends to an abutting engagement with,the plate 43 of the
housing. The jaws 59 of the cammed disc 40 extend through an
opening in the end plate 43 and rotate within the bearing
60 which is retained in the plate 43. A spindle 61
which may be keyed to the outer knob, extends centrally
within the sleeve 62 which is connected to the knob 4.
Accordingly, the knob 4 operates the cammed disc 40 and
drives the clutch actuator disc 54. The clutch actuator
disc is also formed with a hub 63. In the forward position
of the latch operating disc, the lugs 65 are held dis-
engaged from the holes 66 in the rear walls 4' of the
clutch housing 14.
It will be noted that the latch operating disc 54
has an elongated hub 63 which projects rearwardly therefrom
to a central hole in the rear wall 45 of the clutch housing
beyond the rear end of spindle 61, to rotatably receive the
forward end portion of the latch actuating shaft 67. A pin
68 projects radially from the outside of the shaft and
into a notch 69 to establish a driving connection between
the operating disc 54 and the latch actuating shaft 67
capable of accommodating rotation of the shaft relative
to the latch operating disc through an angle of 90 .
Such relative rotation is necessary at times when the spindle
~267S~
61 is drivingly connected to a key-over-ride mechanism
in the outer knob 4, as for example, a pin tumbler lock
which has an operating stroke of 180. In that case, the
forward end of the latch actuat~ng shaft 67 is half cut away
to provide a flat drive abutment 70 lying in a plane containing
the shaft axis. A drive lug 71 on the rear end of the spindle
61 is then so located with respect to the abutment 70 as to
enable the spindle to rotate 90 in the clockwise directian,
as viewed from the knob 4, be~ore it comes into driving
relation with the shaft abutment 70 and rotates the latter
the next 90 relative to the latch operating disc 54. The latch
operating shaft 67 is provided with a square end for operating
the latch in the door.
Normally the latch is operated from the outside knob
4 which drives the cammed disc 40 and through the cam
surfaces engaging the mating cam surfaces on the clutch
operating disc 54. If there is no interference of the
linkage 13, the drive normally retracts the latch for opening
of the door. When, however, there is interference with the
linkage 13, the cammed drive disc 40 rotates relative to
the clutch operating disc 54 and forces the clutch operating
disc 54 rearwardly. This causes the abutment 65 to extend
into the opening 66 and lock the clutch operating disc 54.
With a rearward movement of the clutch operating disc 54,
the spring 56 biases the reset diSc 35 forwardly until the
tabs 38 engage the slots 39 in the forward end of the
cammed drive disc 40. Accordingly, then the reset disc
35 is rotated to the position shown in FIG. 4, and the control
shaft 8 is rotated and the chamber lock is scrambled.
33 The deuice operates in the following manner:
The outside knob 4 is rotated to retract the latch.
6~543
Rotation of the knob 4 in a clockwise direction causes the
linkage 13 to operate. Since the plunger 11 of the time
delay mechanism extends into the path of motion of the cams
28 and 29, it interferes with the movement of the linkage.
This, in turn, causes the cammed drive disc 40 to rotate relative
to the clutch actuator disc 54 and drive the clutch actuator
disc 54 rearwardly so that the lugs 65 move rearwardly into
the opening 66 of end wall 45 and lock the clutch actuating
disc 54 in a stationary position. The rearward movement
of the clutch actuating cam 54 allows the spring 56 to bias
the reset disc 35 rearwardly, unseating the tabs 41 from
the openings 42 in the plate 43 of the clutch housing. This
in turn, permits the reset disc 35 to be rotated by the
cammed drive disc 40 and operate the linkage. The linkage
operates the control shaft 8 and scrambles or cancels any
code that may remain in the lock chamber. Release of the
knob will allow it to rotate counterclcckwise. Counterclockwise
rotation to return the knob 4 to its original retracted
position is caused by the springs 80 engaging the pin 81 in
the shaft 82. The shaft 82 rotates counterclockwise until
the pin 81 returns to a rest position against the stop 83
which is fastened to the panel 6 of the chamber housing.
Rotation of the knob 4 and the linkage in the
manner described also provides another function in that
the cam 28 on the control shaft arm 24 biases the plunger
11 rearwardly moving the plunger out of the path of the
linkage or cams 28 and 29. The plunger will remain in
a retracted position for a predetermined duration of time.
The duration of time is adjustable by an adjustable knob
on the adjustment 17.
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~675f~3
When the code is -then applied to the buttons 5 on the
panel 6, the knob 4 is again rotated and, because there is no
interference with the movement of the linkage due to shaft 8,
the knob will rotate cammed drive disc 40 which will carry the
clutch operating disc 54. Movement of the clutch operating disc
54 will drive the pin 68 and shaft 67 and retract the latch.
The lock chamber, being decoded, allows shaft 8 to rotate in
the opposite direction which carried the arm 31 of the latch
actuating disc 54. Accordingly, the latch is retracted and
the linkage swings to the position shown in Fig. 5 and, in
this position, the latch is retracted and the chamber code
will be cancelled when it returns to its former position,
as shown in FIG. 3.
When the knob 4 is allowed to rotate counterclockwise
the linkage will return to the position shown in FIG. 3 and
the code will be cancelled from the permutation lock chamber.
Adjustment of the adjustor 17 will control the duration
of time of the time delay device. The time may be shortened
or extended, as desired. The microswitch 16 is also provided
with an electrical circuit to the remote indicator which will
indicate to the personnel at a remote location that an attempt
has been made to open the door, or that the door has been opened.
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